/*
 **     Database.h
 **
 **     Published / author: 2005-08-12 / grymse@alhem.net
 **/

/*
 * Copyright (C) 2001-2006 Anders Hedstrom
 * 
 * This program is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along 
 * with this program; if not, write to the Free Software Foundation, Inc., 
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 
 */

#ifndef _DATABASE_H_SQLITE
#define _DATABASE_H_SQLITE

#ifdef _WIN32
#include <windows.h>
#else
#include <pthread.h>
#endif
#include <string>
#include <list>
#ifdef WIN32
typedef unsigned __int64 uint64_t;
typedef __int64 int64_t;
#else
#include <stdint.h>
#endif

#include <sqlite3.h>

#ifdef SQLITEW_NAMESPACE
namespace SQLITEW_NAMESPACE {
#endif


    class IError;
    class Query;
    class Mutex;


/** Connection information and pool. */
    class Database {
      public:
	/** Mutex container class, used by Lock. 
		\ingroup threading */
	class Mutex {
	  public:
	    Mutex();
	    ~Mutex();
	    void Lock();
	    void Unlock();
	  private:
#ifdef _WIN32
	     HANDLE m_mutex;
#else
	     pthread_mutex_t m_mutex;
#endif
	};
      private:
	/** Mutex helper class. */
	 class Lock {
	  public:
	    Lock(Mutex & mutex, bool use);
	    ~Lock();
	  private:
	    Mutex & m_mutex;
	    bool m_b_use;
	};
      public:
	/** Connection pool struct. */
	struct OPENDB {
	    OPENDB():busy(false) {
	    } sqlite3 *db;
	    bool busy;
	};
	typedef std::list < OPENDB * >opendb_v;

      public:
	/** Use file */
	Database(const std::string & database, IError * = NULL);

	/** Use file + thread safe */
	Database(Mutex &, const std::string & database, IError * = NULL);

	virtual ~ Database();

	/** try to establish connection with given host */
	bool Connected();

	void RegErrHandler(IError *);
	void error(Query &, const char *format, ...);
	void error(Query &, const std::string &);

	/** Request a database connection.
The "grabdb" method is used by the Query class, so that each object instance of Query gets a unique
database connection. I will reimplement your connection check logic in the Query class, as that's where
the database connection is really used.
It should be used something like this.
{
		Query q(db);
		if (!q.Connected())
			 return false;
		q.execute("delete * from user"); // well maybe not
}

When the Query object is deleted, then "freedb" is called - the database connection stays open in the
m_opendbs vector. New Query objects can then reuse old connections.
	*/
	OPENDB *grabdb();
	void freedb(OPENDB * odb);

	/** Escape string - change all ' to ''. */
	std::string safestr(const std::string &);
	/** Make string xml safe. */
	std::string xmlsafestr(const std::string &);

	/** Convert string to 64-bit integer. */
	int64_t a2bigint(const std::string &);
	/** Convert string to unsigned 64-bit integer. */
	uint64_t a2ubigint(const std::string &);

      private:
	Database(const Database &):m_mutex(m_mutex) {
	}
	Database & operator=(const Database &) {
	    return *this;
	}
	void error(const char *format, ...);
	// 
	std::string database;
	opendb_v m_opendbs;
	IError *m_errhandler;
	bool m_embedded;
	Mutex & m_mutex;
	bool m_b_use_mutex;
    };


#ifdef SQLITEW_NAMESPACE
}				// namespace SQLITEW_NAMESPACE {
#endif

#endif				// _DATABASE_H
